Pool Filter Replaces Unicel C-4320, Pleatco PA20-4, Filbur FC-1215 Filter Cartridge for Swimming Pool and Spa Media Area 20 sq ft, 4 5/8" OD, Open Hole: 2 1/16" Top, Open Hole: 2 1/16" Bottom, 11 7/8" Long, AK-3008 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 20 sq. ft. In-Line Filter for American Commander II, Hayward CX200-RE, MicroStar-Clear C200, replacement of Unicel C-4320, Pleatco PA20 Baleen Filters Top: Open Hole: 2 1/16" Bottom: Open Hole: 2 1/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures